Except in pure mathematics, nothing is known for certain (although much is certainly false).
CARL SAGANOur species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works.
More Carl Sagan Quotes
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The visions we offer our children shape the future.
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Nothing disturbs me more than the glorification of stupidity.
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Imagination will often carry us to worlds that never were, but without it we go nowhere.
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We make our world significant by the courage of our questions and the depth of our answers.
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The beauty of a living thing is not the atoms that go into it, but the way those atoms are put together.
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Books break the shackles of time, proof that humans can work magic.
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Somewhere, something incredible is waiting to be known.
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There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths.
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You have to know the past to understand the present.
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Your god is too small for my universe.
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Extinction is the rule. Survival is the exception.
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Avoidable human misery is more often caused not so much by stupidity as by ignorance, particularly our ignorance about ourselves.
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Across the sea of space, the stars are other suns.
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An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God.
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Other things being equal, it is better to be smart than to be stupid.
CARL SAGAN